YOUNG’S DOUBLE SLIT EXPERIMENT PART 01
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- Опубліковано 14 сер 2014
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YOUNG’S DOUBLE SLIT EXPERIMENT: We have earlier discussed the phenomenon of interference of waves, therefore, it is natural to expect that light also exhibits the phenomenon of interference. But interference of light is not so evident as the interference of sound waves. This is due to the very small wavelength of light waves as compared to the wavelength of sound waves. In 1801, Thomas young demonstrated successfully the interference of light by performing a double slit experiment. Young allowed sunlight to pass through a hole and then at some distance through two pin holes S1 and S2. When light was received on a screen, an uneven distribution of light intensity was observed on the screen. A number of alternate dark and bright spots were seen on the screen. The phenomenon of interference can be understood on the basis of Huygens principle. The secondary wavelets coming from S1 and S2 have equal amplitude, velocity and wavelength. In figure, the continuous circular arcs represent the regions of wave crest. The dotted circular arcs represent regions of wave trough. At points marked by small circles, the trough of one wave is superposed over the trough of another wave or the crest of one wave falls over the crest of another wave. According to the principle of super position, the amplitude and hence the intensity of the resultant wave is maximum at these points. Similarly, the intensity is minimum at points marked by a “cross”. Thus, the resultant intensity is maximum along the lines connecting the “crosses”. On the screen, we get a number of alternate dark and bright regions of equal width. This is called interference pattern. Analytical treatment of interference.
I think that it's an awesome way to learn......especially when you don't understand anything from the book......Thank You. : )
Yeah!
Is that true??
Yeah it's absolutely true
True
Agreed....
Either light has a split personality, particle vs wave, either that interference pattern is not really an interference pattern, but a diffraction & reflection pattern or something along those lines. Maybe those black lines are just shadows made by the most probable diffraction points, which cast different shadows.
You have explained it well sir
A very very big thank you 🙏 for clearing my concept
U made it so easy to understand.
Just Wow.....Thank uuu so much.
شكرا
Very help ful animation explanation thank you so much
u actually gave me the concept
What material were the walls ? I imagine that reflection of light between walls can create a similar pattern if they were made of a smooth surface.
Thank you
Nyc Gurujii
Awesome 👍
Thank you so much
The bright and dark lines do not appear if source of light is sunlight. Sunlight has almost all the wavelengths while for a clear pattern the beam should be a pure light (only one wavelength)
Yes light should be monochromatic
The best way of learning.
Thanks
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it's awesome
I'm From Bangladesh,,, this class is great
Good explanation of the Idea..
Thank you sir 🙏🏻
thank you for such a great explanation*****
Thank you so much sir
great
Best explanation
But sir...how you know that this is destructive...like the formula of class nstructive can also be applied
Great video
Very
Nice video sir
Nice Lecture
Good explain
Too difficult to grasp how a 450 nm wave could have interference of peaks and troughs that show the pattern of what I would think is bi-refringence with dark and bright regions.
They now use monochromatic light to get that pattern. Young used sun light which is white light. But now they say white light doesnt clearly show the pattern. This means Young clearly didnt see any pattern, but more like imagined there was one.
I dont see either how the interference pattern at such nanoscopic scales would be visible with the human eye !
Awesome
Excellent
thank u
thank you
Really nice sir but I want to know what's the technique used to record this video Can you please explain me sir
Great.
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Link of part 2??
Good 👍
Best explanation one could ever do
Nice
Light inverts through a slit. Just like through a camera lens, or a convex lens at a distance. That is what is not being discussed.
Sincerely,
William McCormick
Thanku sir 🙏🙏
Thank u sir..
👌
The water waves are orders of cm, the light waves are orders of nm. I really dont understand how the interference pattern at such nanoscopic scales (of nano lightwaves) would be visible with the human eye !
Did Thomas Young have a nanoscope back then ?
nice
Gud
In double slit experiment, the conscious observer is not only observing the electron gun, screen containing two slits and detector but also the human body, performing the experiment and thoughts which are forcing the body to act. The conscious observer who is consciousness itself is not observable and hence is observing the entire universe from outside the universe as required by quantum mechanics to collapse the overall wave function of the universe.
Bete mauj kardi
Hehehe boi
@@Arihant8545 yo boiii!
Nicee one... But I recommend to watch it on 1.5x speed... Thank you
❤
good
Thnx a lot..
nice voice n good explaination.......but i need it like notes also....so that we cn write this in exams
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Good approch.........
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Good explanation... But Is this possible with sunlight...?
This is exactly what i want
Asma Arshad hi
My advice to who ever wants to watch this play the speed 1.5×
P.S I still didn't manage to watch the full video
maybe you are too much in a hurry. Just chill out brainy!
Yes
NGL 2X is better than 1.5X.
Exactly I wanted this ....and this is for free...thank you
Thank but I want to ask about the intensity of the fringes are they equal or the central fringe are brighter?
Time : 2.10
You'll get your answer.
@@Bangalibabu95 Thanks but I am asking about the central bright fringe is it more bright than the other fringes? Sorry I didn't get the answer in the video.
@@user-kc8yg7du6m : Yes, Central is maximum, and it keep on diminishing in both the sides. I mean the intensity tends to become less and less, and eventually it disappears.
@@Bangalibabu95 thanks a lot but why is more brighter? Is this due to interfere crest with crest
@@user-kc8yg7du6m : It depends on phase difference, you can see there is a mathematical expression given in any book. If you're much interested to read, then I would recommend you to go through Optics by Ajay Ghatak.
thnx
❤️
Hiii Arihant!
So what to do...
Phase difference for dark fringe or destructive interference is (2n+1)nλ and not (2n+1)nπ
no its ( 2n + 1 ) π
I think it's (2n-1)pi
By using sunlight we will get colourful band of unequal width... There should be monochromatic light source of light
What's wrong with a little color?
@@schmetterling4477 you will not be able to notice the dark and bright bands formed during the interference, which is the whole point of this experiment. If a monochromatic source of light is used, these fringes can be observed. You will also find that the distance between two consecutive bright or dark bands is λd/D, where d is the distance between two slits and D is the distance of separation of slits from the screen.
@@krivlex8214 The whole point of this experiment is to show that light is a wave phenomenon. That can easily be done with polychromatic light.
@@schmetterling4477 yeah, but the thing is you can't really make out the dark and bright bands. The monochromatic light used makes it easier to prove that light is a wave phenomenon.
@@krivlex8214 There is no such thing as monochromatic light. All light has a spectrum with finite width, even if we can make light with a very narrow spectrum. It therefor follows that there is no such thing as a perfect minimum. You have to stop mistaking the absolute predictions of mathematical approximations for necessary scientific criteria. That is not how we do it in physics, even if we simplify it that far at the high school level.
Ok
5:14 phase difference should be (n+1/2)2pi
Is it correct or wrong ...????? Friend...
@@heenatecheducation7471 wrong
The name of the experiment contains double slit how are you saying pinholes it is conceptually incorrect
Are you a robot or something? That's a weird accent, mate.
ikr really weird
Why is it so...
Jason qiu it'd auto robot man
Ky
It's a robotic voice
it was monochromatic light, not sunlight
But why did he put the single slit before the other two ? This makes it a THREE slit experiment, not double slit. These scientists cannot even count, but they know exactly what happens lol.
still I didn't get what is 'P'
Lol its a point dipshit😂
Is that a bot reading? I really cant tell.
yes, with hindi accent lol
Hi sani
Ba my kkka
A mistake in 5.16min phase difference formula.take into account please
is the correct formula - (2n + 1)lamda /2
did u say pee on the screen? dude come on
Its TRIPLE SPLIT obviously...and the pattern of interference is most likely just a reflection pattern of photons in between the walls. MYTH BUSTED.
Why would light travel as a wave horizontally, or is it a spiral type wave? And if you adjust the distance of the wall with the light sensors with the wall with the 2 slits can you do so and get a dark spot in the middle of the back wall? If not, why not if the waves are interfering with dark spots between?
well......................
They now use monochromatic light to get that pattern. Young used sun light which is white light. But now they say white light doesnt clearly show the pattern. This means Young clearly didnt see any pattern, but more like imagined there was one.
"Michelson and Morley (1887) and other early experimentalists using interferometric techniques in an attempt to measure the properties of the luminiferous aether, *used monochromatic light only for initially setting up their equipment, always switching to white light for the actual measurements.* The reason is that measurements were recorded visually. Monochromatic light would result in a uniform fringe pattern. Lacking modern means of environmental temperature control, experimentalists struggled with continual fringe drift even though the interferometer might be set up in a basement. Since the fringes would occasionally disappear due to vibrations by passing horse traffic, distant thunderstorms and the like, it would be easy for an observer to "get lost" when the fringes returned to visibility. The advantages of white light, which produced a distinctive colored fringe pattern, far outweighed the difficulties of aligning the apparatus due to its low coherence length.[23] This was an early example of the use of white light to resolve the "2 pi ambiguity"." - Interferometry, Wikipedia
I don't understood any thing
No needof books, building of college, lectures etc
❤️From Pakistan
At point O the fringe that appear it must be the central bright fringe but this video shows that its an bright fringe . Also you say that the width of fringes are equal, while the central bright fringes has a double width of any bright fringes
And if the fringe that appear at the point O isn't the central Bright fringe, so where is the central bright fringe
Please I want an answer to all of this and to clarify whether what I'm saying an error
Omar Abdul Ghani this is interference of light where the width of fringes dark or bright are equal whereas in Diffraction of light you get central bright fringe that is double the width of the lateral fringes
Thanks diana
Anyone seeing this in 2023😮
Thanks a lot sir
thank u
Nice
nice
But why did he put the single slit before the other two ? This makes it a TRIPLE slit experiment, not double slit. These scientists cannot even count, but they know exactly what happens lol.
nice
nice
But why did he put the single slit before the other two ? This makes it a TRIPLE slit experiment, not double slit. These scientists cannot even count, but they know exactly what happens lol.
But why did he put the single slit before the other two ? This makes it a TRIPLE slit experiment, not double slit. These scientists cannot even count, but they know exactly what happens lol.
But why did he put the single slit before the other two ? This makes it a TRIPLE slit experiment, not double slit. These scientists cannot even count, but they know exactly what happens lol.
But why did he put the single slit before the other two ? This makes it a 3 slit experiment, not double slit. These scientists cannot even count, but they know exactly what happens lol.